Campagnolo's incredible Record Crankset sports amazing stiffness from their beautiful multi-directional carbon crankarms. They're meticulous design is thin and light to rocket you forward with every rotation. The rotation comes from a unique, integrated spindle that joins the crankset together via a toothed Hirth joint in the center. And it spins on Campy's ultra-smooth bottom-bracket bearings which are included and fit into outboard cups (sold separately). Plus, the Record chainrings sport special pins and plating for fast, silent shifts, and long life.